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A planning tool for integrating crop choices with weed management in the Northern Great Plains

Published online by Cambridge University Press:  12 February 2007

Randy L. Anderson
Randy L. Anderson*
Affiliation:
US Department of Agriculture, Agricultural Research Service (USDA-ARS), Northern Grain Insects Research Laboratory in Brookings, South Dakota, 57006, USA
*
*Corresponding author: randerson@ngirl.ars.usda.gov
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Abstract

Crop production in the Northern Great Plains is rapidly changing because of no-till practices; producers now grow a diversity of crops with winter wheat to increase production as well as to manage weeds. With the multitude of crops available, producers are asking for guidelines to sequence crops in rotations that help weed management. We developed a planning tool that lists various choices with crops when designing a rotation; the choices are arranged by impact on weed dynamics as quantified by research in the region. The tool includes choices among crops, such as varying crops with different life cycles, planting dates, or row spacing, and choices within an individual crop, such as varying cultivar or planting date. Choices among crops impact weeds the most, whereas choices within an individual crop are less effective and usually lead to lower crop yield. For example, rotations comprised of two cool-season crops followed by two warm-season crops can reduce weed populations six- to 12-fold. In contrast, replacing a standard-height cultivar with a taller cultivar that is more competitive with weeds, is often inconsistent for weed management, whereas crop yield may be less. Producers associated with the Northern Plains Sustainable Agricultural Society felt that the planning tool would encourage long-range planning as well as help integrate weed management with the design of cropping systems. The purpose of the tool is to encourage ecologically based weed management, which can reduce herbicide inputs by 50% for Northern Great Plains producers.

Keywords

cultural practicesecologically based weed managementrotation design
Type
Research Article
Information
Renewable Agriculture and Food Systems , Volume 19 , Issue 1 , March 2004 , pp. 23 - 29
Copyright
Copyright © Cambridge University Press 2004

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